Multiple PApplet on android

Android Processing

hiroshi

in Android Processing • 2 years ago

Hello, I have a question about android screen handling.

I try to develop small music app which has 3 screens, so want to provide go/back UI between them.

My plan is using BACK button on device to back to previous screen, but BACK button kills "Activity". (see http://forum.processing.org/topic/sketches-don-t-want-to-quit-on-the-phone)

It seems nice to have different Activity for each 3 screens. So I tested duplicating PApplet for each screens and it works fine. But it means resources for PApplet is also duplicated. I'm happy if I can replace base PApplet Activity and new Activity instance.

Any suggestion or another good way?

Replies(2)

Jesse Sco..

Re: Multiple PApplet on android

2 years ago

I've always used some type of onscreen option to navigate between different screens, based on mousePressed like this:

color S1Color = color(100);
color S2Color = color(100);
color S3Color = color(200);
fill(S1Color);
ellipse(sw/4, 9*(sh/10), sh/20, sh/20);
fill(S2Color);
ellipse(sw/2, 9*(sh/10), sh/20, sh/20);
fill(S3Color);
ellipse(3*(sw/4), 9*(sh/10), sh/20, sh/20);
if(mousePressed) {
if(mouseY > 8*(sh/10)) {
if(mouseX > ((sw/4)-sh/10) && mouseX < ((sw/4)+sh/10) ) {
gNotificationManager.notify(1, gNotification);
displayState = 1;
}
else if(mouseX > ((sw/2)-sh/10) && mouseX < ((sw/2)+sh/10) ) {
gNotificationManager.notify(1, gNotification);
displayState = 2;
}
}
}

then in draw() make a logic like this

if(displayState == 1) {
State1();
}
else if(displayState == 2) {
State2();
}
else if(displayState == 3) {
State3();
}

then code my seperate UI's in the respective State() function, for instance.

Not very elegant, but it's functional, and efficient.

Interested to see/hear any more findings on the Activity though!

~ J

PS - if you wanted to use the MENU and HOME keys instead (though not sure what device you have, not all have a MENU), you could use them to toggle backwards or forwards (it's not a bad idea to override the HOME key anyways, depending on whether your using resources that need to be properly released)... or just use one (the MENU key, as long as you don't have any text fields, which will not properly release it) and cycle through your screens...

hiroshi

Re: Re: Multiple PApplet on android

2 years ago

Yes, It will work perfect. But I prefer to use device button to provide natural UI.

Here is my code to handle multiple PApplet.

MainScreen.java

public class MainScreen extends PApplet {
public void setup(){ ... }
public void draw(){ ... }
public boolean surfaceTouchEvent(MotionEvent e){
// move to SecondScreen
Intent intent = new Intent(this, SecondScreen.class);
startIntent(intent);
}
}

SecondScreen.java

public class SecondScreen extends PApplet {
public void setup(){ ... }
public void draw(){ ... }
public void keyPressed(){
if(key == CODED && keyCode == BCAK){
// back to MainScreen
finish(); // my android phone(htc evo) does not work without finish() due to heavy task. ActivityManager kills MainScreen Activity after backward.
}
}
}